This paper analyzed the feature of the warship brigade mission. A three-phased mission decomposition method based on atomic task was brought forward to decompose the warship brigade mission, and the brigade mission was described based on hierarchy, relation and attribute. IDEF3 was extended by introducing substitution and conjunct intersection and a warship brigade mission reliability modeling method based on extended IDEF3 is proposed. Finally, the example of warship brigade aerial defense mission has been illustrated to prove the validity of the modeling method.
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